KR100469767B1 - Florescent lamp and lighing apparatus - Google Patents

Abstract

The present invention provides a fluorescent lamp having a required total luminous flux, and a lighting device using the same, which reduce the amount of the three-wavelength luminescent phosphor.

The fluorescent lamp has an average particle diameter of 1.0 µm or more including a translucent discharge vessel 1 made of a glass bulb 1a and strontium pyrophosphate (Sr ₂ P ₂ O ₇ ) having a rod-shaped particle shape. A non-luminescent material film having a film thickness of 3 to 25 µm formed of a mixture of high-reflectivity non-luminescent material particles and three-wavelength luminescent phosphor particles as a main component and disposed almost entirely on the inner surface side of the translucent discharge vessel 1 ( 2), a phosphor layer 3 having a film thickness of 30 µm or less, which is mainly composed of three-wavelength luminescent phosphor particles, which is disposed over almost the entire inner surface side of the non-luminescent material film 2, and a translucent discharge vessel ( A pair of electrodes 4 and 4 arranged to cause a discharge inside 1) and a discharge medium enclosed in the translucent discharge container 1 are provided.

Description

Fluorescent lamp and lighing apparatus

The present invention relates to a fluorescent lamp having an improved phosphor layer and a lighting device using the fluorescent lamp.

Since rare earth phosphors are remarkably expensive compared to calcium halophosphate phosphors, attempts have been made to reduce the amount of their use. For example, Japanese Patent Laid-Open No. 64-6355 discloses that the average value of the spectral reflectance in the wavelength range from ultraviolet to infrared is 100% for each wavelength of the spectral reflectance curve of the magnesium oxide soft film. At least 90% of the inorganic white powder and phosphors are included, and the inorganic white powder includes titanium, cerium, cadmium, cesium, antimony, potassium, scandium, zirconium, germanium, aluminum, lutetium, lanthanum, gardium, It is described to form a phosphor layer of a fluorescent lamp using a light emitting composition doped with at least one dopant selected from the group consisting of terbium, boron and silicon at a rate of 5% by weight or less. (Prior Art 1)

According to the prior art 1, by mixing an inorganic white powder doped with a predetermined dope agent to a phosphor, a content that can reduce the amount of expensive rare earth phosphors used without causing a deterioration in lamp characteristics over time is described. have.

In addition, Japanese Patent Application Laid-Open No. 2-43303 discloses that the phosphor particles have a large reflectance in the visible region and the ultraviolet region in the wavelength region, and the average particle having the same particle size as that of the phosphor particles at an average particle diameter of 2 µm or more and about 10 µm or less. A light emitting composition in which at least one kind of a white powdery inorganic substance having a diameter is blended in an amount of up to 230% over 10% of the total weight of the phosphor particles, and a mercury vapor discharge lamp formed by the composition are described. Technology 2)

According to the prior art 2, it is described that the decrease in the brightness can be reduced even if the amount of the white powder inorganic material is significantly increased as compared with the prior art 1. That is, the prior art 2 is characterized in that the white powdery inorganic substance is used solely as an extender for phosphors. Therefore, the white powdery inorganic material is "a chemically stable material, that is, it has a poison which is hard to be changed to the conditions of the process in which fluorescent lamp is manufactured, for example, magnesia, alumina, silica, titania, Oxides and complex oxygens, including oxides of relatively light metal elements such as zirconia, or composite oxides thereof, and phosphates, silicates, sulfates such as magnesium, aluminum, calcium, titanium, zinc, strontium, zirconium, cadmium, tin, and barium It is excellent in poor solubility, heat resistance, and weather resistance, such as an acid salt, and also stable to ultraviolet irradiation under reduced pressure, and the average value of the spectral reflectance over the range from 190 nm to 700 nm is the spectra of the magnesium oxide softening rate. When the reflectance curve is 100% for each wavelength, an inorganic material having 90% or more Is preferred. "Describes a generic condition. Also, "representative inorganics are pyrophosphates, oltphosphates, or mixtures of alkaline earth metals (preferably calcium)." I am doing it. In the examples, only calcium pyrophosphate is used as the white powdery inorganic substance.

The inventors have verified the light output of fluorescent lamps based on the prior art 2 in terms of their characteristics. Even in the case of a white powder inorganic material, there is a low ultraviolet reflecting property depending on the material, and it is sufficient to mix this inorganic material with the phosphor layer. In some cases, light output could not be obtained. On the other hand, the rare earth phosphor is generally used as a three wavelength luminescent phosphor by mixing a red luminescent phosphor, a green luminescent phosphor and a blue luminescent phosphor. However, since each phosphor of each light emission color has a different specific gravity and particle shape corresponding to a different chemical composition, it is difficult to form each phosphor particle at a uniform mixing ratio in a long glass bulb.

In addition, in order to form a phosphor layer, generally, the fluorescent substance suspension which added the binder and the binder to the solvent is adjusted, this flows down inside the glass bulb, the fluorescent substance adheres to the inner surface, and the glass bulb is further baked. do. In this way, the solvent is volatized, the binder is burned, the phosphor particles are bound by the binder, and the phosphor layer is formed on the inner surface side of the glass bulb.

In the prior arts 1 and 2, when the phosphor suspension of the three-wavelength luminescent phosphor flows down into the glass bulb, the chromaticity of the light emission of the phosphor layer changes on the inlet side and the outlet side of the suspension (hereinafter, referred to as "the tube end"). Color difference "is likely to occur. That is, when two or more kinds of phosphors are mixed to form a phosphor layer, there is a problem that the color difference at the end of the tube is remarkable depending on the combination of the phosphors. For example, although it is known that a high total luminous flux can be obtained by using the europium called BAM and the manganese active barium magnesium aluminum fluorescent substance as a blue light-emitting fluorescent substance, Since the color difference at the end of the tube becomes more remarkable, it is difficult to use it conventionally. In addition, in the case of adding and mixing a magnetized phosphor to a three wavelength luminescent phosphor, it is easy to produce a tube end color difference.

MEANS TO SOLVE THE PROBLEM While examining the inorganic substance mixed with fluorescent substance, this inventor discovered that a difference in an ultraviolet ray reflectance or a difference in a tube color difference occurs due to a difference in the inorganic substance. As a result of further investigation according to this finding, it was found that the use of strontium strontium strontium phosphate Sr ₂ P ₂ O _{7 in} which the particle shape of the inorganic material was deformed in the shape of a rod made it stable to a high level of light output characteristics, or It was found that the color difference at the end of the tube can be effectively suppressed.

1 is a partially cutaway view showing one embodiment of a fluorescent lamp of the present invention,

2 is a side cross-sectional view of the enlarged main part;

Fig. 3 is a scanning electron micrograph showing an enlarged magnification of 5000 times of strontium pyrophosphate, which is a high-reflectivity non-luminescent material particle used in the first embodiment of the fluorescent lamp of the present invention.

Fig. 4 is a graph showing the relationship between the addition amount of the non-light-emitting substance particles made of strontium pyrophosphate and the tube end color difference in the first embodiment of the fluorescent lamp of the present invention together with that of the comparative example,

5 is a graph showing the relationship between the amount of non-luminescent material particles made of strontium pyrophosphate and the total luminous flux simultaneously with that of the comparative example,

Fig. 6 is a graph showing the relationship between the addition amount of non-luminescent material particles made of strontium pyrophosphate and the average color rendering index Ra together with that of the comparative example,

Fig. 7 shows the luminous flux maintenance characteristics of each modification example in which the addition amount of the non-light-emitting substance particles made of Example 2 in the first embodiment of the fluorescent lamp of the present invention and also of strontium pyrophosphate is changed together with that of Comparative Example 2; Is a graph that represents

Fig. 8 is a perspective view showing a ceiling direct mounted fluorescent lamp as one embodiment of the lighting apparatus of the present invention.

<Description of Symbols for Main Parts of Drawings>

1: light-transmissive discharge container 1a: bulb

1b: flare system 1b1: exhaust pipe

1b2 flare 2: phosphor layer

3: electrode 4: inner lead wire

5: external lead line 12: fluorescent lamp

21: lighting device body 21a: lamp socket

23: discharge lamp lighting device

SUMMARY OF THE INVENTION The present invention has been made in accordance with the above findings, and has a light output characteristic that is stable at a high level, or effectively reduces the tube color difference and reduces the amount of use of the three-wavelength luminescent phosphor, while having a desired total luminous flux and It is an object to provide a lighting apparatus using this.

A fluorescent lamp according to the first embodiment of the present invention comprises: a light-transmissive discharge vessel comprising a glass bulb; The main component consists of a mixture of high-reflectivity non-luminescent material particles and three-wavelength luminescent phosphor particles having an average particle diameter of 1.0 μm or more including strontium pyrophosphate (Sr ₂ P ₂ O ₇ ) in the shape of rods. A phosphor layer disposed on the inner surface side of the translucent discharge vessel; A pair of electrodes disposed to cause a discharge inside the translucent discharge container; And a discharge medium enclosed in the light-transmissive discharge container.

In the present invention and the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.

The fluorescent lamp produced by the present invention includes a transparent discharge vessel, a phosphor layer formed on the inner surface side of the transparent discharge vessel, a pair of electrodes sealedly attached to both ends of the transparent discharge vessel, and a discharge sealed in the transparent discharge vessel. At least the medium is provided. Moreover, it is permissible to provide a clasp etc. as needed. Hereinafter, the fluorescent lamp manufactured by this invention is demonstrated for every component.

<Transparent discharge vessel>

The translucent discharge vessel is formed by sealing both ends of the glass bulb using a sealing member such as an end plate, or directly by pinch seal or the like without using it. When sealing using an end plate, the part of an end plate is generally comprised by a stem. When using a stem, a well-known stem structure, such as a flare stem, a bead stem, a button stem, can be employ | adopted.

The glass bulb allows the shape of a straight pipe, a curved pipe, or a curved pipe. Further, the glass bulb allows a structure in which a plurality of straight pipes, curved pipes, or curved pipes are connected so that one discharge path is formed by a connecting pipe.

In addition, the tube diameter of the glass bulb and the tube axis of the transparent discharge vessel, in other words, the length along the discharge path is not limited. In general, however, the tube diameter of the translucent discharge vessel is 40 mm or less, and the length along the tube axis is 2400 mm or less. In the case of fluorescent lamps for general lighting having a relatively small pipe wall load, the tube diameter is 25 to 38 mm and the length is 300 to 2400 mm along the tube axis. In addition, in the case of a fluorescent lamp dedicated to high frequency lighting, the diameter is 15 to 25.5 mm and the length is 500 to 2400 mm along the tube axis. In the case of the compact fluorescent lamp, the tube diameter is 25 mm or less, for example, 12 to 22 mm, and the length is 2400 mm or less, for example, 200 to 2300 mm along the tube axis. In the case of the bulb type fluorescent lamp, the tube diameter is 13 mm or less, for example, 8 to 12 mm, and the length is 500 mm or less along the tube axis, for example, 400 to 500 mm.

Next, the material of the glass bulb of the translucent discharge vessel is not particularly limited as long as it has airtightness, workability and fire resistance, but in general, soft glass used in this type of fluorescent lamp is preferable. The soft glass includes lead glass, soda lime glass, barium silicate glass, and the like, but any of them may be used. As environmental response, soda lime glass and barium silicate glass are preferable. However, in view of workability, soda-lime glass and lead glass can be used together. For example, the part of the bulb which uses the most glass can be formed with soda-lime glass, and the part of a stem can be formed with lead glass.

If necessary, glass other than soft glass such as hard glass, semi-hard glass or quartz glass can be used as the glass bulb. Moreover, the deterioration of fluorescent substance by precipitation of an alkali component can also be suppressed using what is called lead-free glass with low content rate of alkali components, such as sodium.

Next, the shape of the translucent discharge vessel will be described. The translucent discharge vessel may be either straight tube or annular. In addition, if necessary, the U-shaped, semi-circular, and U-shaped portions are connected in series and allowed to have various shapes such as shapes in a suitable arrangement.

<About phosphor layer>

In the fluorescent lamp of the present invention, a phosphor layer is composed of a mixture of high-reflectivity non-luminescent material particles and three-wavelength luminescent phosphor particles as main components.

(Non-luminescent material particles)

The non-luminescent material particles contain, as essential components, strontium pyrophosphate (Sr ₂ P ₂ O ₇ ) in which the particle shape is rod-shaped, and in the range of 200-800 nm of high reflectance wavelength. Material having a reflectance at each wavelength of is larger than that of barium sulfate, for example, particles of aluminum oxide (Al ₂ O ₃ ), calcium pyrophosphate (Ca ₂ P ₂ O ₇ ), and the like, in addition to the strontium pyrophosphate. to be. In addition, the term "particle shaped rod-shaped" means that most of the particles of strontium pyrophosphate are rod-shaped, and the portion of the rod is almost straight, or the boomerang shape with the middle bent. Shape), V-shape, branched shape, or the like, which means that the mold is clearly released compared to the sphere. In order to obtain strontium pyrophosphate Sr ₂ P ₂ O _{7 in} which the particle shape is _released , it is effective to use the material produced by calcining the material at a high temperature of 1000 ° or more and purifying crystals of high purity. As a result, strontium pyrophosphate is high in purity and extremely high in ultraviolet reflectance and hardly absorbs magnetic light. Since the grain shape of such crystals tends to be a rod-shaped mold release, it becomes a target of selecting a use material.

The proportion of strontium pyrophosphate in which the particle shape is rod-shaped and in the total non-luminescent material particles having a high reflectance is relatively broadly acceptable, generally 10% by mass or more, suitably 30% by mass or more, and 50 optimally. It can contain -100 mass%. In addition, the addition ratio of the high reflectance non-luminescent material particle contained in a fluorescent substance layer is generally 1-70 mass%, Preferably it is 10-60 mass%. The average particle diameter of the non-luminescent material particles having high reflectance is 1 µm or more, preferably 3 to 10 µm, including strontium pyrophosphate in which the particle shape is rod-shaped. However, it is possible to add 1 to 2% by mass of high reflectivity non-luminescent material particles having an ultrafine particle shape having an average particle diameter of 10 to 20 nm, for example, ultrafine particle type gamma alumina or the like into the phosphor layer. In this case, the ultra-fine particle non-light-emitting substance particles contribute to the improvement of the binding force with the particle sand of the phosphor layer and the glass wall as a binder.

In addition, the phosphor layer is formed on the inner surface side of the translucent discharge vessel. "Inner surface side" means a protective film or an oxidized film formed by directly contacting the inner surface of the light-transmissive discharge container and having a mean particle size of 0.01 to 0.02 µm, ultra-fine gamma alumina, or the like having a film thickness of 5 µm or less. This means that either the shape or the shape formed indirectly through a reflecting film such as titanium may be used.

The three wavelength luminescent phosphor particles are configured to mix the phosphor particles of the red luminescent phosphor, the green luminescent phosphor and the blue luminescent phosphor to produce white light emission. As the red light-emitting phosphor, for example, an europium-activated yttrium oxide phosphor (common name "YOX") or the like can be used. As the green light-emitting phosphor, for example, cerium, terbium-activated lanthanum phosphate, terbium-activated celium terbium magnesium magnesium aluminum phosphor (common name "CAT"), or the like can be used. Examples of the blue light-emitting phosphor include europium-linked strontium phosphate phosphors, europium-linked strontium-barium-calcium phosphate phosphors (commonly referred to as "apatite"), and europium-linked active barium magnesium magnesium aluminum phosphors (commonly known as "BAM"). Etc. can be used. Further, the three-wavelength luminescent phosphor particles have an average particle diameter of 2 to 10 µm, preferably 5 µm ± 2 µm, and optimally 5 µm ± 1 µm. In addition, in this invention, the average particle diameter of fluorescent substance and the above-mentioned non-light-emitting substance particle shall be a Coulter Multisizer.

An example of the chemical formula of each of the three wavelength luminescent phosphors is as follows.

1. Red light emitting phosphor

(1) europium phosphorous active yttrium phosphor

Y ₂ O ₃ : Eu

2. Green light emitting phosphor

(1) lanthanum phosphate

LaPO ₄ : Ce, Tb

(2) terbium part active selium, terbium, magnesium, aluminum phosphor

(CeTb) MgAl ₁₁ O ₁₉ : Tb

3. Blue light emitting phosphor

(1) europium part strontium phosphate phosphor

Sr ₅ (PO ₄ ) ₃ Cl: Eu

(2) Europium part active strontium barium calcium phosphate phosphor

(SrCaBa) ₅ (PO ₄ ) ₃ Cl: EU

3) Europium, manganese active barium, magnesium, aluminum phosphor

BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn

<A pair of electrodes>

A pair of electrodes is arrange | positioned so that a discharge may generate | occur | produce inside the translucent discharge container. For example, they are sealed at both ends in the translucent discharge vessel, causing low pressure mercury vapor discharge among them. As the electrode, a known electrode such as a filament electrode, a ceramic electrode and a cold cathode can be used.

The filament electrode is formed by applying an electron-emitting material to a double coil or triple coil of tungsten, and connects both ends to a front end of a pair of inner lead wires that gas-tightly penetrates the transparent discharge vessel. Equipped with.

For example, the ceramic electrode is composed of granules, sponges, or ingots mainly composed of oxides of alkaline earth elements and transition metal elements in an electrically conductive container having openings, and covered with carbides or nitrides of transition metal elements. I) It has a structure which accommodates the hot electron emission material which consists of a composite ceramic of shape, and is supported by the front end of one inner lead wire.

<About discharge media>

The discharge medium contains mercury and a rare gas in order to perform low pressure mercury vapor discharge.

Mercury is encapsulated with liquid mercury or with an amalgam exhibiting mercury vapor pressure characteristics close to liquid mercury, for example, amalgam of Zn-Hg or Ti-Hg system. In order to encapsulate liquid mercury, liquid mercury can be dropped or taken into a capsule, and then the capsule can be destroyed by appropriate means after being encapsulated and mercury can be taken out. In addition, in order to encapsulate it as amalgam, it can shape | mold in felt shape or can make it have amalgam by using a suitable metal plate as a base. That is, in the case of Zn-Hg type amalgam, it is suitable for shape | molding and sealing in felt shape. Moreover, in the case of Ti-Hg type amalgam, it is suitable to carry it on a metal plate. The latter is also referred to as a mercury-emitting alloy, but is heated to release mercury by applying a high frequency after sealing.

Next, the rare gas is also used as a buffer gas in order to facilitate the discharge of the fluorescent lamp, and the argon Ar, krypton Kr, neon Ne and the like are enclosed in a translucent discharge vessel of about 200 to 400 Pa. In addition, the rare gas may be filled with Ar alone, or may be a mixed seal of Ar-Kr, Ne-Ar-Kr, Ne-Ar, or the like.

<The function of this invention>

In the present invention, high-reflectivity non-luminescent material particles containing strontium pyrophosphate in which the particle shape is rod-shaped in the phosphor layer are added, so that the non-luminescent material particles of high reflectivity do not enter the phosphor particles. The probability that ultraviolet light incident on the light is reflected and incident on the phosphor particles is increased. For this reason, even if the usage-amount of fluorescent substance is reduced, the visible light radiate | emitted from fluorescent substance particle increases and the whole luminous flux of fluorescent lamp can be maintained at a high value. For example, even in the case where non-luminescent material particles having high reflectance are added to the phosphor layer at a ratio of 50% by mass, it is possible to obtain a total luminous flux of about 95% as compared with 100% of the phosphor. Since the non-luminescent material particles having high reflectance are very inexpensive compared to the three-wavelength phosphor, the amount of the three-wavelength phosphor is reduced so that the cost of the fluorescent lamp can be reduced while maintaining the total luminous flux almost equally. Can be.

In addition, in the present invention, by mixing high-reflectivity non-luminescent material particles containing strontium pyrophosphate in the form of rod-shaped particles in the phosphor layer, the ultraviolet light reflectance of the non-luminescent material is significantly increased, and the light output is improved. In addition, the optical output characteristics are stable with little variation. In addition, the mechanism is not clear, but the color difference at the end of the tube is reduced. It is speculated that the rod-shaped mold release of the strontium pyrophosphate particles does not work effectively. Therefore, even when a BAM having a large amount of light emission is used as a blue light emitting phosphor or a dark red light emitting magnetite phosphor is used, the color difference at the end of the tube is clearly suppressed, and the difference is almost confirmed when the light emission color is visually compared. It is within acceptable range. In addition, the effect of reducing the color difference at the end of the tube is expressed when some of the non-luminescent material particles having high reflectance include particles of strontium pyrophosphate whose particle shape is rod-shaped, and is 10% by mass of the entire non-luminescent material particles having high reflectance. If it contains more than about, it produces sufficient effect.

According to a second aspect of the present invention, there is provided a fluorescent lamp comprising: a translucent discharge container made of a glass bulb; It consists of a mixture of high-reflectivity non-luminescent material particles and three-wavelength luminescent phosphor particles having an average particle diameter of 1.0 μm or more including strontium pyrophosphate (Sr ₂ P ₂ O ₇ ) obtained by firing at a temperature of 1000 ° C. or higher. A phosphor layer disposed on the inner surface side of the translucent discharge vessel; A pair of electrodes disposed to cause a discharge inside the translucent discharge container; It is characterized by including a discharge medium enclosed in a translucent discharge container.

The present invention stipulates a configuration in which strontium pyrophosphate in high reflectivity non-luminescent material particles mixed in a phosphor layer is obtained by firing at a temperature of 100 캜 or higher. In other words, the above configuration makes the crystal of strontium pyrophosphate high in purity, extremely high ultraviolet reflectance, and hardly absorbs magnetic light. As a result, as described in the first embodiment, a fluorescent lamp with stable light output characteristics can be obtained.

The fluorescent lamp of the third embodiment is the fluorescent lamp according to the first or second embodiment, wherein the non-luminescent material particles having high reflectance are 1 to 70% by mass of the phosphor layer.

The present invention defines a preferred range of addition rate of non-luminescent material particles having high reflectance. In other words, even if 70 mass% of the phosphor layer having high reflectance is added, it is possible to obtain a total luminous flux of about 90% as compared with 100% of the phosphor.

The fluorescent lamp according to the fourth embodiment is the fluorescent lamp according to any one of the first to third embodiments, wherein the three-wavelength luminescent phosphor particles are blue luminescent phosphors of the europium-activated active barium magnesium magnesium aluminum phosphor. And (BAM).

The present invention stipulates a preferable configuration in which phosphors having high luminous efficiency are used as blue light emitting phosphors among the three wavelength light emitting phosphor particles of the phosphor layer. That is, BAM is known as a blue light emitting phosphor with high luminous efficiency. However, conventionally, when this phosphor was used, there was a problem that the color difference at the end of the tube was remarkable. In the present invention, the color difference at the end of the tube is reduced by using a rod-shaped die-shaped mold at least a part of the non-luminescent material particles having a high reflectance or using strontium pyrophosphate particles calcined at 100 ° C. or higher. It became possible to practically solve the problem of color difference at the end of the tube.

As such, in the present invention, the total luminous flux of the fluorescent lamp is improved. For example, this invention is equipped with the phosphor layer of the same film thickness which contains 50% of non-luminescent material particles of high reflectance compared with the whole luminous flux of the fluorescent lamp which has the phosphor layer comprised by 100% of apatite as a blue light-emitting fluorescent substance. In the case of the fluorescent lamp, the total luminous flux of 100% or more can be obtained even though the amount of the phosphor particles used is reduced to 50%.

The fluorescent lamp of the fifth embodiment is the fluorescent lamp according to any one of the first to fourth embodiments, wherein the three-wavelength luminescent phosphor particles contain a magnetized phosphor.

In the present invention, the phosphor layer contains a jammer phosphor which tends to produce a color difference at the end of the tube. However, at least a part of the high-reflectivity non-luminescent material particles has a rod-shaped die-shaped or pyrophosphate fired at 100 ° C. or higher. By using the particles of strontium, the color difference at the end of the tube is reduced, thereby making it possible to practically solve the problem of the color difference at the end of the tube. Moreover, since the red light emission increases, color rendering improves.

An illumination device of the sixth embodiment includes: an illumination device main body; A fluorescent lamp according to any one of the first to fifth embodiments supported by the illuminating device body; And a lighting device for applying power to the fluorescent lamp.

In the present invention, the term "lighting device" is a broad concept including all devices that use light emission of fluorescent lamps for some purpose. Illustrative lighting devices include lighting fixtures, direct backlight devices, display devices and signal lamp devices. Moreover, although a lighting fixture is preferable to the lighting fixture for home use, it is not limited to this, It is suitable also for a store lighting fixture, an office lighting fixture, an outdoor lighting fixture, etc. In addition, "a lighting apparatus main body" means the remainder part except a fluorescent lamp and a lighting circuit from a lighting apparatus.

The lighting circuit is a means for lighting the fluorescent lamp under predetermined conditions, and can be disposed in the lighting apparatus main body. However, if necessary, it may be spaced apart from the lighting device body and placed, for example, behind a ceiling. As the lighting circuit, a magnetic leakage transformer mainly composed of a coil and a core, a choke coil, or an electronic lighting circuit mainly composed of a high frequency inverter can be used.

Thus, the lighting apparatus of the present invention exhibits the action and effect of the first to fifth embodiments.

(Example)

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

1 and 2 show a first embodiment of the fluorescent lamp of the present invention, FIG. 1 is a partially cutaway side view, and FIG. 2 is an enlarged main portion side cross-sectional view. This embodiment corresponds to the invention of claims 1 to 6. In each drawing, reference numeral 1 denotes a translucent discharge vessel, numeral 2 denotes a phosphor layer, numeral 3 an electrode, numeral 4 an inner lead wire, numeral 5 an outer lead wire, and numeral 6 a clasp. The fluorescent lamp of this embodiment is a straight tube fluorescent lamp. The translucent discharge container 1 consists of a bulb 1a and a pair of flare systems 1b, and forms the sealing part of both ends. The bulb 1a is made of soda lime glass. The flare stem 1b is equipped with the exhaust pipe 1b1 and the flare 1b2, and seals a pair of inner lead wire 4 and the outer lead wire 5, respectively. In the exhaust pipe 1b1, the base end is chipped off, and the front end is connected to the translucent discharge container 1 in series. The flare 1b2 is sealed at both ends of the bulb 1a to form a gas-tight transmissive discharge vessel 1. The inner lead wires 4 and the outer lead wires 5 are connected to each other via the gummet wire inside the flare system 1b, thereby maintaining gas-tightness with respect to the flare system. The exhaust pipe 1b1 shown in FIG. 2 is sealed after evacuation and sealing of the translucent discharge container 1. The phosphor layer 2 is composed of non-luminescent material particles having high reflectance and three-wavelength luminescent phosphor particles, and is disposed on the inner surface of the translucent discharge vessel 1. The non-luminescent material particle | grains of high reflectivity are comprised using the strontium pyrophosphate whose particle shape made the rod shape mold release. The particle shape of strontium pyrophosphate is as showing in the photograph of FIG. 3, and it turns out that it is rod-shaped (hexagonal plate shape). Fig. 3 is a scanning electron micrograph showing an enlarged magnification of 5000 times of strontium pyrophosphate, which is a high-reflectivity non-luminescent material particle used in the first embodiment of the fluorescent lamp of the present invention. The electrode 3 is formed by applying an electron-radioactive substance to a double coil tungsten wire filament, and a line is connected to the front end of the pair of inner lead wires 4. The clasp 6 is a cap-shaped molded article made of aluminum, and has a pair of clasps 6a and 6a, and the pair is attached to both ends of the translucent discharge container 1. The discharge medium encloses liquid mercury and argon Ar in the translucent discharge container 1 at a pressure of 330 Pa.

Example 1

It is FL20SS / 18 type, and has a tube diameter of 28 mm, a tube length of 580 mm, and a total length of 595.5 mm or less of the transparent discharge vessel 1.

Phosphor layer; Film thickness 20㎛

(1) three wavelength luminescent phosphor particles; Average particle diameter 5㎛

Red light emitting phosphor; Y ₂ O ₃ : Eu

Green light emitting phosphor; LaPO ₄ : Ce, Tb

Blue light emitting phosphor; BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn

(2) non-luminescent material particles; Average particle diameter 3㎛

(3) The composition ratio of each component of the phosphor layer 2 is as follows in mass%.

3 wavelength luminescent phosphor particles: non-luminescent material particles = 50: 50

Example 2

Blue light emitting phosphor; (SrCaBa) ₅ (PO ₄ ) ₃ Cl: Eu

The rest of the configuration is the same as that of the first embodiment.

Except for including 10%, 30%, and 70% of the non-luminescent material particles in addition to the above Examples 1 and 2, except that each of the same modifications as in Examples 1 and 2, and not containing the non-luminescent material particles Fig. 1 shows graphs prepared according to the results of measuring fluorescent tube of Comparative Example 1 and Comparative Example 2 as in Example 1 and 2, respectively, and measuring the tube end color difference, total luminous flux, and average color rendering index Ra. 4 to 6 are shown. In addition, in each figure, the horizontal axis is addition amount (mass%) of non-light-emitting substance particle | grains. In addition, the curve A is each of Example 1, each modified example, and the comparative example 1, The curve which connected between each data, and the curve B are the data of Example 2, each modified example, and the comparative example 2. Each of the curves connecting the

Fig. 4 is a graph showing the relationship between the addition amount of the non-light-emitting substance particles made of strontium pyrophosphate and the tube end color difference in the first embodiment of the fluorescent lamp of the present invention together with that of the comparative example. The vertical axis represents the color difference (%) at the end of the tube.

Fig. 5 is a graph showing the relationship between the amount of non-luminescent material particles made of strontium pyrophosphate and the total luminous flux simultaneously with that of the comparative example. The vertical axis represents the total luminous flux (relative value).

Fig. 6 is a graph showing the relationship between the addition amount of non-luminescent material particles made of strontium pyrophosphate and the average color rendering index Ra simultaneously with that of the comparative example. The vertical axis represents the average color rendering index Ra.

(Performance of fluorescent lamps)

① end color difference; As for Example 1, Example 2, and each modified example, it was recognized that the color difference at the end of a tube was significantly reduced compared with Comparative Example 1 and Comparative Example 2.

② total luminous flux; As for Example 1, Example 2, and each modified example, although the whole luminous flux is falling compared with the comparative example 1 and the comparative example 2, the ratio of the fall is few. That is, Example 1 is about 8%, and Example 2 is 7%. However, in the case of Example 1, compared with the comparative example 2, it is worth noting that it is almost equivalent or more.

Further, as the amount of the non-light-emitting substance particles made of strontium pyrophosphate increases, the degree of reduction of the total luminous flux increases. However, even when the addition amount of the non-luminescent material particles made of strontium pyrophosphate is 70%, 90% can be maintained as compared with Comparative Examples 1 and 2.

③ average color rendering index; In Example 1, Example 2, and each modified example, there is little difference with Comparative Example 1 and Comparative Example 2. From this, it can be seen that even if the addition amount of the non-light-emitting substance particles made of strontium pyrophosphate has little effect on the average color rendering index.

Fig. 7 shows the luminous flux maintenance characteristics of each modification example in which the addition amount of the non-luminescent material particles made of Example 2 in the first embodiment of the fluorescent lamp of the present invention and also of strontium pyrophosphate is changed together with that of Comparative Example 2; It is a graph showing. In the drawings, the horizontal axis represents the lighting time h, and the vertical axis represents the total luminous flux (relative value), respectively. In addition, curve C is Example 2, curve D is a modified example of the addition amount of the non-luminescent material particles consisting of strontium pyrophosphate 10%, curve E is a modified example of 30%, curve F is a fluorescent lamp of Comparative Example 2 Indicates.

As can be understood from the drawing, although the light beam fall of the initial stage of lighting is somewhat remarkable, both of the fluorescent lamps exhibit the same light beam sustaining characteristics with almost the same tendency.

Example 3

It is FL40S · F type, has a tube diameter of 28 mm and a tube length of 1198 mm for the transparent discharge vessel 1.

Phosphor layer; Film thickness 20㎛

(1) three wavelength luminescent phosphor particles; Average particle diameter 4㎛

Red luminescent phosphors; Y ₂ O ₃ : Eu

Dark red light-emitting phosphor; 3.5 MgO0.5 MgF ₂ GeO ₂ : Mn

Green light emitting phosphor; LaPO ₄ : Ce, Tb

Blue light emitting phosphor; (SrCaBa) ₅ (PO ₄ ) ₃ Cl: Eu

(2) non-luminescent material particles; Average particle diameter 3㎛

(3) The compounding ratio of the three wavelength luminescent phosphor particles and the non-luminescent material particles of the phosphor layer 2 is as follows by mass%.

3 wavelength luminescent phosphor particles: non-luminescent material particles = 70: 30

Lamp characteristics; Total luminous flux 2630 lm, Average color rendering index 88

Next, in the present Example, only the modified examples 1-4 which changed the compounding ratio of the 3 wavelength luminescent fluorescent substance particle and the non-luminescent substance particle, and the 3 wavelength luminescent fluorescent substance except having the phosphor layer of 20 micrometers in thickness are provided. Table 1 shows the total luminous flux and the tube end color difference of the comparative example which consist of the fluorescent lamp of the same specification as this Example.

Table 1

material Blending ratio of non-luminescent material particles (%) Total luminous flux (lm) Color difference Modification example 1 10 2670 0.0038 Modification Example 2 30 2630 0.0027 Example 50 2570 0.0020 Modification Example 3 60 2500 0.0018 Modification example 4 70 2410 0.0015 Comparative example - 2680 0.0053

Fig. 8 is a perspective view showing a ceiling-directed fluorescent lamp fixture as one embodiment of the lighting apparatus of the present invention. In the figure, reference numeral 21 denotes an illuminator body, 22 denotes a fluorescent lamp, and 23 denote a discharge lamp lighting device.

The lighting device main body 21 incorporates a discharge lamp lighting device 23 therein and includes a lamp socket 21a and the like.

The fluorescent lamp 12 constitutes a part of the discharge lamp lighting device, but is supported by the lighting device main body 21 by being attached to the lamp socket 21a.

In the discharge lamp lighting device 23, the circuit portion thereof is disposed in the lighting device main body 21. As shown in FIG.

According to the first embodiment of the present invention, there is provided a mixture of a transmissive discharge vessel, a three-wavelength luminescent phosphor particle, and a non-luminescent material particle having a high reflectivity of 1 µm or more having an average particle diameter including strontium pyrophosphate having a rod-shaped morphology. And a pair of electrodes and an ionization medium encapsulated inside the translucent discharge vessel, comprising a phosphor layer disposed on the inner surface side of the translucent discharge vessel, and using an expensive three-wavelength fluorescent substance. In addition, it is possible to provide a fluorescent lamp in which the total luminous flux is reduced, the light output characteristic is stable, and the color difference at the tube end of the phosphor layer is reduced.

According to a second embodiment of the present invention, there is provided a non-luminescent material particle having a high reflectivity of at least 1. 0 µm, including a translucent discharge vessel, three wavelength luminescent phosphor particles, and strontium pyrophosphate obtained by firing at 1000 ° C or higher. The mixture is composed as a main component and includes a phosphor layer disposed on the inner surface side of the translucent discharge vessel, a pair of electrodes, and an ionization medium encapsulated in the translucent discharge vessel, so that the tube end color difference of the phosphor layer is reduced. At the same time, it is possible to reduce the amount of expensive three-wavelength luminescent phosphors used, and furthermore, to provide a fluorescent lamp in which the total luminous flux is low.

According to the third embodiment of the present invention, a fluorescent lamp having a total luminous flux of 9O% or more in the case of a phosphor layer of only phosphors can be provided by the non-luminescent material particles having high reflectance being 1 to 70% by mass of the phosphor layer. There is a number.

According to the fourth embodiment of the present invention, the blue light-emitting phosphor of the three-wavelength luminescent phosphor particles contains the europium active barium magnesium magnesium aluminum phosphor (BAM), so that the total light flux is high and the tube It is possible to provide a fluorescent lamp with a markedly reduced end color difference.

According to the fifth embodiment of the present invention, in addition, since the three-wavelength luminescent phosphor particles contain a magnetized phosphor, a deep red luminescence is applied to have a high color rendering property, and a fluorescent lamp with remarkably reduced tube color difference. I can provide it.

According to the sixth embodiment of the present invention, there is provided a lighting device main body, the fluorescent lamp according to any one of the first to fifth embodiments supported by the lighting device main body, and a lighting device for applying a force to the fluorescent lamp. The lighting apparatus which has the effect of 1st-5th embodiment can be provided.

Claims (6)

A translucent discharge vessel comprising a glass bulb; Non-luminescent material particles and 3-wavelength luminescent particles having a high reflectivity of 1.0 µm or more having an average particle diameter including strontium pyrophosphate (Sr ₂ P ₂ O ₇ ) in which the particle shape is rod-shaped and sintered at a temperature of 1,000 ° C. or higher. A phosphor layer composed of a mixture of phosphor particles as a main component and disposed on an inner surface side of the translucent discharge vessel; A pair of electrodes disposed to cause a discharge inside the translucent discharge container; A fluorescent lamp comprising a discharge medium encapsulated in a translucent discharge container. delete The fluorescent lamp according to claim 1, wherein the non-luminescent material particles having high reflectance are 1 to 70% by mass of the phosphor layer. The fluorescent material according to claim 1 or 3, wherein the three-wavelength luminescent phosphor particles contain a europium-activated barium-magnesium-aluminum phosphor (BAM). lamp. The fluorescent lamp according to claim 1 or 3, wherein the three wavelength luminescent phosphor particles contain a magnetizer phosphor. A fluorescent lamp according to any one of claims 1 or 3 supported by the illuminating device body; And a lighting device for applying power to the fluorescent lamp.